We study the symmetry of solutions to a class of Monge-Ampère type equations from a few geometric problems. We use a new transform to analyze the asymptotic behavior of the solutions near the infinity. By this and a moving plane method, we prove the radially symmetry of the solutions.

B. Franchi and E. Lanconelli, Radial symmetry of the ground states for a class of quasilinear elliptic equations, in Nonlinear Diffusion Equations and Their Equilibrium States (eds. W.-M. Ni, L. A. Peletier and James Serrin), Springer-Verlag, (1988), 287–292.
doi: 10.1007/978-1-4613-9605-5_17.

B. Franchi and E. Lanconelli, Radial symmetry of the ground states for a class of quasilinear elliptic equations, in Nonlinear Diffusion Equations and Their Equilibrium States (eds. W.-M. Ni, L. A. Peletier and James Serrin), Springer-Verlag, (1988), 287–292.
doi: 10.1007/978-1-4613-9605-5_17.